GB/T 18604-2014: Translated English of Chinese Standard. (GBT 18604-2014, GB/T18604-2014, GBT18604-2014): Measurement of natural gas flow by gas ultrasonic flow meters
https://www.chinesestandard.net, 30 nov 2019 - 70 pagine
This Standard specifies measurement performance requirements of gas ultrasonic flow meters, flow meter body requirements, installation and maintenance, field verification test requirements, and flow calculation methods and measurement uncertainty estimates.
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Installation requirements and maintenance
Annex A informative Fundamental principles
normative Exitfactory testing requirements
Annex G informative Monitoring and guarantee of onsite measurement
according to formula accuracy acoustic noise acoustic path adjustment angle Annex applicable attenuation average flow axial calculated according cause certificate Clause coefficient correction corresponding density detection determine deviation diameter direction documents downstream effect electronic components ensure error Estimation exceed factor Figure flow calculation flow calibration flow measurement flow rate flow regulator fluid formula frequency function gas flow gas ultrasonic flow GB/T hole indication influence inner inspection installation least maintenance manufacturer materials maximum meet meter body method natural gas necessary on-site operation output parameters path length position pressure obtaining hole pressure regulating valve pulse qmax range ratio received record relative replaced requirements signal processing unit sound velocity specified speed of sound standard reference conditions temperature measurement hole theoretical transiting tube turbulence ultrasonic flow meter ultrasonic transducer uncertainty upstream velocity distribution verification zero-flow